CN101064513A - Digital-to-analog conversion circuit and conversion method - Google Patents
Digital-to-analog conversion circuit and conversion method Download PDFInfo
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- CN101064513A CN101064513A CN 200610077652 CN200610077652A CN101064513A CN 101064513 A CN101064513 A CN 101064513A CN 200610077652 CN200610077652 CN 200610077652 CN 200610077652 A CN200610077652 A CN 200610077652A CN 101064513 A CN101064513 A CN 101064513A
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Abstract
The invention relates to a digital-to-analog conversion circuit and a conversion method, wherein the circuit comprises a processor and a low-pass filter, and the output end of the processor is coupled with the input end of the low-pass filter; the low-pass filter is connected with the output end of the processor, and the low-pass filter is connected with the input end of the low-pass filter. The method comprises the following steps: the digital signal shaping circuit shapes the digital signal output by the processor, so that the low level of the digital signal corresponds to 0 level, the high level corresponds to power supply voltage, the shaped digital signal is output to the low-pass filter, and the low-pass filter outputs a corresponding analog signal. The invention adds a digital signal shaping circuit and improves the performance of the digital-to-analog conversion circuit.
Description
[technical field]
The present invention relates to digital signal is converted to the D/A converting circuit and the conversion method of analog signal.
[background technology]
Digitlization, intellectuality are the development trends of current electronic equipment, and in a large amount of practical applications, digital control and digital processing all needs to carry out the conversion between analog quantity and the digital quantity.Existing D/A converting circuit, as shown in Figure 1, D/A converting circuit comprises processor and low pass filter, wherein, processor adopting microprocessing unit (MCU) or digital signal processor (DSP); The I/O mouth (output) of processor sends digital signal (as pwm signal), and low pass filter carries out filtering to this digital signal, exports the corresponding simulating signal afterwards, thereby has finished the process of digital-to-analogue conversion.
With processor output 3.3V Transistor-Transistor Logic level is example, and the level oscillogram is referring to Fig. 2, and on the one hand, because physical cause, there is discreteness in device, and for the processor of same model, the high-low level of Different Individual output is discrepant; On the other hand, because temperature is floated, the processor of same model is operated under the different temperatures, and the high-low level of its output also is discrepant.For these reasons, the digital signal of processor output there are differences, and causes filtered digital-to-analogue conversion result also variant, thereby has influenced the precision of digital-to-analogue conversion.
[summary of the invention]
The technical problem to be solved in the present invention provides D/A converting circuit and conversion method, can improve the precision of digital-to-analogue conversion.
The present invention adopts following technical scheme to realize:
D/A converting circuit comprises processor and low pass filter, and the output of described processor and the input of described low pass filter are coupled; Also comprise the digital signal shaping circuit, it is connected between the input of the output of described processor and described low pass filter, be used for the digital signal of described processor output is carried out shaping, make corresponding 0 level of low level of described digital signal, high level corresponding power voltage, and the digital signal after the shaping exported to described low pass filter, described low pass filter is exported corresponding analog signal.
Further improvement of the present invention is: also comprise sample circuit, it is connected between the sampling end of the output of described low pass filter and described processor, is used to gather described analog signal, and gives described processor; Described processor is according to the signal that receives, the digital signal of corresponding its output of adjusting.
Further improvement of the present invention is: described processor comprises A/D converter, fine setting controller and digital signal generator, the input of described A/D converter is as the sampling end of described processor, its output is electrically connected with described digital signal generator by described fine setting controller, and the output of described digital signal generator is as the output of described processor; Described A/D converter becomes sampled digital signal to described analog signal conversion, the given signal of the more described sampled digital signal of described fine setting controller and its internal preset, get an error signal, and to digital signal generator output fine adjustment signal, and then the output signal of regulating digital signal generator.
Further improvement of the present invention is: described sample circuit is the A/D sample circuit.
Further improvement of the present invention is: described digital signal shaping circuit is a logic gates, and its input and output are respectively as the input and the output of described digital signal shaping circuit.
Further improvement of the present invention is: described digital signal shaping circuit comprises reference voltage circuit, the 12 resistance, the 22 resistance, the 32 resistance and the 12 operational amplifier, DC power supply links to each other with the reverse input end of the 12 operational amplifier by the 12 resistance, and this tie point is by the 22 grounding through resistance; The output of described reference voltage circuit connects the output of described the 12 operational amplifier by the 32 resistance; The positive input of described the 12 operational amplifier and output are respectively as the input and the output of described digital signal shaping circuit.
Further improvement of the present invention is: described reference voltage circuit comprises power supply fiducial chip, the 42 resistance, the 52 resistance, the 62 resistance and the 12 electric capacity, one termination DC power supply of described the 42 resistance, its other end, successively second pin by the power supply fiducial chip, the 3rd pin ground connection, by the series arm ground connection of the 52 resistance and the 62 resistance, also by the 12 capacity earth; The tie point of the 52 resistance and the 62 resistance is connected first pin of power supply fiducial chip, and second pin of described power supply fiducial chip is as the output of described reference voltage circuit.
Further improvement of the present invention is: described digital signal is pwm signal or PFM signal.
Digital-analog convertion method, comprise: the digital signal shaping circuit carries out shaping to the digital signal of processor output, make corresponding 0 level of low level of described digital signal, high level corresponding power voltage, and the digital signal after the shaping exported to low pass filter, described low pass filter is exported corresponding analog signal.
Further improvement of the present invention is: further comprising the steps of:
1001, sample circuit is gathered the analog signal of described low pass filter output, and gives described processor collection result;
1002, processor is handled described collection result, and the given signal of comparison process result and its internal preset, gets an error signal, and the digital signal of corresponding its output of adjusting.
The invention has the beneficial effects as follows: increased the digital signal shaping circuit between the output of processor and the input of low pass filter, digital signal to processor output is carried out shaping, make corresponding 0 level of low level of this digital signal, high level corresponding power voltage has improved the performance of D/A converting circuit; Also increased sample circuit between the output of low pass filter and the sampling end of processor, come to feed back the output signal of low pass filter to processor by sample circuit, make processor suitably regulate its output as the case may be, improved the precision and the stability of D/A converting circuit output; The digital signal shaping circuit can adopt with door or other forms of circuit and realize, and is simple in structure, is easy to realize.
[description of drawings]
Fig. 1 is the D/A converting circuit block diagram of prior art.
Fig. 2 is a 3.3V Transistor-Transistor Logic level oscillogram.
Fig. 3 is a D/A converting circuit block diagram of the present invention.
Fig. 4 is the digital signal shaping circuit in the embodiment of the invention one and the circuit connection diagram of low pass filter.
Fig. 5 is the digital signal shaping circuit in the embodiment of the invention two and the circuit connection diagram of low pass filter.
[embodiment]
Be that example is further set forth the present invention in conjunction with the accompanying drawings below with the pwm signal:
Fig. 3 is a D/A converting circuit block diagram of the present invention, is with the difference of D/A converting circuit block diagram of the prior art (referring to Fig. 1): on the one hand, increased the pwm signal shaping circuit between the output of processor and filter input end; On the other hand, between the sampling end of the output of filter and processor, increased sample circuit.
D/A converting circuit of the present invention comprises processor, pwm signal shaping circuit, low pass filter and sample circuit, be connected the pwm signal shaping circuit between the output of processor and the input of low pass filter, be used for the pwm signal of processor output is carried out shaping, make corresponding 0 level of low level of described pwm signal, high level corresponding power voltage, and the pwm signal after the shaping exported to described low pass filter, described low pass filter is exported corresponding analog signal; Be connected sample circuit between the sampling end of processor and the output of low pass filter, be used to gather the analog signal of low pass filter output, and give described processor; The signal that described processor processing receives, the pwm signal of corresponding its output of adjusting.
Wherein, processor comprises A/D converter, fine setting controller and pwm signal generator, the input of described A/D converter is as the sampling end of described processor, its output is electrically connected with described pwm signal generator by described fine setting controller, and the output of described pwm signal generator is as the output of described processor; Described A/D converter becomes sampled digital signal to described analog signal conversion, the given signal of the more described sampled digital signal of described fine setting controller and its internal preset, draw an error signal, and carry out amount trimmed and calculate, and to pwm signal generator output fine adjustment signal, thereby the output signal of regulating the pwm signal generator.
In addition, do not include A/D converter in some processor, at this time just must add an A/D converter between sample circuit and processor, perhaps sample circuit adopts the A/D sample circuit, in order to finish the Analog signals'digital conversion.
Embodiment one
Pwm signal shaping circuit of the present invention can adopt logic gates to realize, this logic gates can be made of not gate by constituting with door, also can be by constituting jointly with door and not gate.As shown in Figure 4, the pwm signal shaping circuit of present embodiment is a not gate, its input and output are respectively as the input and the output of pwm signal shaping circuit, the pwm signal of processor output is added on the input of not gate U1, through after the shaping, making pwm signal become low level is 0V, high level is the pwm signal of supply voltage, export to the third-order low-pass filter of back level by its output, third-order low-pass filter is to after carrying out filtering through the pwm signal after the shaping, obtain the corresponding simulating signal, finished the process of digital-to-analogue conversion.
Third-order low-pass filter among Fig. 4 comprises first to the 5th resistance (R1---R5), first to the 3rd electric capacity (C1---C3) and the second operational amplifier U2, one end of first resistance R 1 is as the input of low pass filter, this end connects the output of not gate U1, its other end connects the positive input of the second operational amplifier U2 successively by second resistance R 2, the 3rd resistance R 3, the tie point of first resistance R 1 and second resistance is by first capacitor C, 1 ground connection; The positive input of the second operational amplifier U2 is by the 3rd capacitor C 3 ground connection; The tie point of second resistance R 2 and the 3rd resistance R 3 is connected the output of the second operational amplifier U2 by second capacitor C 2; The reverse input end of the second operational amplifier U2 is by the 4th resistance R 4 ground connection, and the two ends of the 5th resistance R 5 are connected on respectively on the reverse input end and output of the second operational amplifier U2.Wherein, first resistance R 1 and first capacitor C 1, second resistance R 2 and second capacitor C 2, the 3rd resistance R 3 and the 3rd capacitor C 3 have constituted three rank filtering jointly.
In general, to the requirement difference of quality of voltage, the filter that then adopts can be different, if less demanding to quality of voltage then adopts the filter of single order or second order; High-quality if desired voltage then adopts three rank or the low pass filter of high-order (as quadravalence or more than the quadravalence) more.
Embodiment two
As shown in Figure 5, pwm signal shaping circuit of the present invention comprises reference voltage circuit, the 12 resistance R the 12, the 22 resistance R the 22, the 32 resistance R 32 and the 12 operational amplifier U12, DC power supply VCC links to each other with the reverse input end of the 12 operational amplifier U12 by the 12 resistance R 12, and this tie point is by the 22 resistance R 22 ground connection; The output of described reference voltage circuit connects the output of described the 12 operational amplifier U12 by the 32 resistance R 32; The positive input of described the 12 operational amplifier U12 and output are respectively as the input and the output of described pwm signal shaping circuit; Here it is pointed out that described the 12 operational amplifier U12 can replace with comparator, the effect of shaping can be better.
Wherein, reference voltage circuit comprises power supply fiducial chip U22, the 42 resistance R the 42, the 52 resistance R the 52, the 62 resistance R 62 and the 12 capacitor C 12, one termination DC power supply VCC of described the 42 resistance R 42, its other end, successively second pin 2 by power supply fiducial chip U22, the 3rd pin 3 ground connection, by the series arm ground connection of the 52 resistance R 52 and the 62 resistance R 62, also by the 12 capacitor C 12 ground connection; The tie point of the 52 resistance R 52 and the 62 resistance R 62 is connected first pin 1 of power supply fiducial chip U22, and second pin 2 of described power supply fiducial chip U22 is as the output of described reference voltage circuit.
Wherein, low pass filter adopts second-order low-pass filter, it comprises the 72 resistance R the 72, the 82 resistance R the 82, the 22 capacitor C 22 and the 32 capacitor C 32, one end of the 72 resistance R 72 is as the input of low pass filter, the output that connects the 12 operational amplifier U12, its other end is connected with the 82 resistance R 82, this tie point is by the 22 capacitor C 22 ground connection, the other end of the 82 resistance R 82 is as the output of filter, and this end is by the 32 capacitor C 32 ground connection.
In the present embodiment, the 12 resistance R 12, the 22 resistance R 22, the 32 resistance R 32 and the 12 operational amplifier U12 have formed Block1, it is 0V that its effect becomes pwm signal into low level exactly, high level is the pwm signal of supply voltage, (model is power supply fiducial chip U22: AZ431), the 42 resistance R 42, the 52 resistance R 52, the 62 resistance R 62 and the 12 capacitor C 12 have been formed Block2, (Block2 can be made up of other power supply fiducial chip circuit), its effect provided high-precision reference voltage as the PWM high level voltage, and Block1 and Block2 have formed the PWM shaping circuit jointly.
In sum, the present invention has increased the digital signal shaping circuit, can carry out effective shaping to the output signal of processor, and export more satisfactory digital signal, improves the conversion accuracy of D/A converting circuit; The present invention has also increased sample circuit, can make the digital signal of processor output meet default requirement more in real time to the output signal of processor feedback low pass filter, has improved the precision and the stability of D/A converting circuit output simultaneously.
In addition, the present invention is suitable equally to the conversion of other digital signals (as PFM signal, i.e. pulsed frequencymodulated signal); The present invention extends on the D/A converting circuit of multichannel, utilizes less processor resource, improves the precision and the stability of multi-channel digital and analogue change-over circuit output.
Claims (10)
1, D/A converting circuit comprises processor and low pass filter, and the output of described processor and the input of described low pass filter are coupled; It is characterized in that: also comprise the digital signal shaping circuit, it is connected between the input of the output of described processor and described low pass filter, be used for the digital signal of described processor output is carried out shaping, make corresponding 0 level of low level of described digital signal, high level corresponding power voltage, and the digital signal after the shaping exported to described low pass filter, described low pass filter is exported corresponding analog signal.
2, D/A converting circuit according to claim 1 is characterized in that: also comprise sample circuit, it is connected between the sampling end of the output of described low pass filter and described processor, is used to gather described analog signal, and gives described processor; Described processor is according to the signal that receives, the digital signal of corresponding its output of adjusting.
3, D/A converting circuit according to claim 2, it is characterized in that: described processor comprises A/D converter, fine setting controller and digital signal generator, the input of described A/D converter is as the sampling end of described processor, its output is electrically connected with described digital signal generator by described fine setting controller, and the output of described digital signal generator is as the output of described processor; Described A/D converter becomes sampled digital signal to described analog signal conversion, the given signal of the more described sampled digital signal of described fine setting controller and its internal preset, get an error signal, and to digital signal generator output fine adjustment signal, and then the output signal of regulating digital signal generator.
4, D/A converting circuit according to claim 2 is characterized in that: described sample circuit is the A/D sample circuit.
5, D/A converting circuit according to claim 1 and 2 is characterized in that: described digital signal shaping circuit is a logic gates, and its input and output are respectively as the input and the output of described digital signal shaping circuit.
6, D/A converting circuit according to claim 1 and 2, it is characterized in that: described digital signal shaping circuit comprises reference voltage circuit, the 12 resistance (R12), the 22 resistance (R22), the 32 resistance (R32) and the 12 operational amplifier (U12), DC power supply (VCC) links to each other with the reverse input end of the 12 operational amplifier (U12) by the 12 resistance (R12), and this tie point is by the 22 resistance (R22) ground connection; The output of described reference voltage circuit connects the output of described the 12 operational amplifier (U12) by the 32 resistance (R32); The positive input of described the 12 operational amplifier (U12) and output are respectively as the input and the output of described digital signal shaping circuit.
7, D/A converting circuit according to claim 6, it is characterized in that: described reference voltage circuit comprises power supply fiducial chip (U22), the 42 resistance (R42), the 52 resistance (R52), the 62 resistance (R62) and the 12 electric capacity (C12), one termination DC power supply (VCC) of described the 42 resistance (R42), its other end, second pin (2) by power supply fiducial chip (U22) successively, the 3rd pin (3) ground connection, series arm ground connection by the 52 resistance (R52) and the 62 resistance (R62), also by the 12 electric capacity (C12) ground connection; The tie point of the 52 resistance (R52) and the 62 resistance (R62) is connected first pin (1) of power supply fiducial chip (U22), and second pin (2) of described power supply fiducial chip (U22) is as the output of described reference voltage circuit.
8, D/A converting circuit according to claim 1 is characterized in that: described digital signal is pwm signal or PFM signal.
9, digital-analog convertion method, it is characterized in that, comprise: the digital signal shaping circuit carries out shaping to the digital signal of processor output, make corresponding 0 level of low level of described digital signal, high level corresponding power voltage, and the digital signal after the shaping exported to low pass filter, described low pass filter is exported corresponding analog signal.
10, digital-analog convertion method according to claim 9 is characterized in that, and is further comprising the steps of:
1001, sample circuit is gathered the analog signal of described low pass filter output, and gives described processor collection result;
1002, processor is handled described collection result, and the given signal of comparison process result and its internal preset, gets an error signal, and the digital signal of corresponding its output of adjusting.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102790528A (en) * | 2011-05-16 | 2012-11-21 | 上海华建电力设备股份有限公司 | Simple electric isolated DC analog transmitting output module |
| CN104991142A (en) * | 2015-07-09 | 2015-10-21 | 杭州亿恒科技有限公司 | Signal analyzer and device and processing method |
| CN105450373A (en) * | 2014-08-22 | 2016-03-30 | 上海贝尔股份有限公司 | Method and apparatus for transmitting data in front backhaul network |
| CN105978572A (en) * | 2016-04-29 | 2016-09-28 | 宁波帝洲自动化科技有限公司 | High-precision digital to analog conversion circuit based on PWM |
| CN108565886A (en) * | 2018-01-29 | 2018-09-21 | 新日(无锡)发展有限公司 | A kind of photovoltaic generating system for new-energy automobile |
| CN110890877A (en) * | 2019-11-21 | 2020-03-17 | 北京大华无线电仪器有限责任公司 | Implementation method of multi-path adjustable reference voltage |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6172634B1 (en) * | 1998-02-25 | 2001-01-09 | Lucent Technologies Inc. | Methods and apparatus for providing analog-fir-based line-driver with pre-equalization |
| WO2002080370A2 (en) * | 2001-03-30 | 2002-10-10 | Infineon Technologies Ag | Oversampling in analogue-digital and digital-analogue converters |
| CN100423452C (en) * | 2003-08-27 | 2008-10-01 | 浙江中控技术股份有限公司 | D/A converting circuit and method for realizing D/A converting |
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2006
- 2006-04-25 CN CN2006100776520A patent/CN101064513B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102790528A (en) * | 2011-05-16 | 2012-11-21 | 上海华建电力设备股份有限公司 | Simple electric isolated DC analog transmitting output module |
| CN105450373A (en) * | 2014-08-22 | 2016-03-30 | 上海贝尔股份有限公司 | Method and apparatus for transmitting data in front backhaul network |
| CN104991142A (en) * | 2015-07-09 | 2015-10-21 | 杭州亿恒科技有限公司 | Signal analyzer and device and processing method |
| CN105978572A (en) * | 2016-04-29 | 2016-09-28 | 宁波帝洲自动化科技有限公司 | High-precision digital to analog conversion circuit based on PWM |
| CN108565886A (en) * | 2018-01-29 | 2018-09-21 | 新日(无锡)发展有限公司 | A kind of photovoltaic generating system for new-energy automobile |
| CN110890877A (en) * | 2019-11-21 | 2020-03-17 | 北京大华无线电仪器有限责任公司 | Implementation method of multi-path adjustable reference voltage |
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